As a now almost 15 year long user (crazy to think about) of 1password I am unsure what attacks do you mean? Did passwords get lost and it was not disclosed or what did you mean by the lack of transparency?

That is my bad; I was thinking of LastPass[1] where it took them months to fully disclose and explain a very serious breach of data.

1Password seem to have a good transparency track record (I edited the original comment)

[1] https://news.ycombinator.com/item?id=34097142